1) Try to keep it to posting one picture at a time.
2) If you are posting directly beneath the picture you are replying about, don't quote the original post, it will make the page about 2x longer than it needs to be.
3) Stick to the topic - Don't post random pictures of irrelevant crap.

So yeah - have fun. Keep it appropriate, don't be an asshole, and it's a pretty simple format.

I'll start - Here's a promo picture that I used for my band's CD last year.